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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e30537d8869337f48346a07ad96355ee69de97f58b23e1912eb55c6acedb96ef' 
  AND token = 'DcDHxH9lquy7ykJ9s1mSIPrlkqWYzgrjdpJdIq13CP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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