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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '61657dd3818fbc46a14148e1bd5a0ffb447da84cf1cfab2f392bad19f7e8c06b' 
  AND token = 'A9IHafy5+KJZlmE2aS1Pc3ol4QbQ8vPYxUnw+TDMPFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}