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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b75d336706efde67927ce1760e5752088fe4711e7d8e5bf5a1fe899bab305e0a' 
  AND token = 'D/oU8HP+0ddSEVOXthD7O6IldJT3zlF12DZjjF9actg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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