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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d4df2c337c6ec4bab0fb14aac9acf113615040d0f366025e5447a568bf3070b' 
  AND token = 'F1TCjFFTvajcR7gSyu05M1cJ16CZ+3E6RhcprY/Urvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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