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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f1534a14f2ec30daa67e85ca4097fcf129373df0d17e6cc506f45f3fedeb391' 
  AND token = 'OrsNHpQXI2xhfL9Az9M5MCEirZD1DUodUg62JJs/G1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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