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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07e830a13fe20926019008ed81a02580ac6c5dd1bc8514d8efbbc3259532e0ea' 
  AND token = 'R3msbXSNsKkHjt6oetRxXn1iiQ+Q2y8bmy90po4WmXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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